add pr template

Author: bvaisvil

.github/pull_request_template.md

@@ -0,0 +1,55 @@
+# Pull Request
+
+## Summary
+
+<!-- One or two sentences describing what this PR does and why. -->
+
+## Type of Change
+
+- [ ] Bug fix
+- [ ] New feature / enhancement
+- [ ] Performance improvement
+- [ ] Refactor (no behavior change)
+- [ ] Documentation
+- [ ] CI / tooling
+
+## Related Issue
+
+Closes # <!-- issue number, or "N/A" -->
+
+## Changes
+
+<!-- Bullet list of notable changes. Focus on the *what*, not the *how*. -->
+
+-
+-
+
+## Testing
+
+<!-- Describe how you tested this. Include platforms if relevant. -->
+
+**Platforms tested:**
+- [ ] Linux
+- [ ] macOS
+- [ ] Other: ___
+
+**Test steps:**
+
+1.
+2.
+
+## Performance Impact
+
+<!-- If this touches rendering, metrics collection, or data structures, note any perf implications.
+     Include before/after flamegraph or benchmark numbers if available. -->
+
+N/A
+
+## Checklist
+
+- [ ] `cargo clippy` passes with no new warnings
+- [ ] `cargo test` passes
+- [ ] `cargo fmt` applied
+- [ ] No new `unwrap()`/`expect()` without justification in a comment
+- [ ] non-obvious logic have doc comments
+- [ ] CHANGELOG updated (if user-facing change)